fix(core): add bigint to MessagePlaceholder type

[pkasarda]

Problem

Libraries like Zod type validation bounds as number | bigint (e.g. ZodTooSmallIssue.minimum: number | bigint). Passing these values directly in t template literals causes a TypeScript error:

error TS2345: Argument of type 'number | bigint' is not assignable 
to parameter of type 'MessagePlaceholder'.
  Type 'bigint' is not assignable to type 'MessagePlaceholder'.

Solution

Add bigint to the MessagePlaceholder type in @lingui/core/macro:

 export type MessagePlaceholder =
   | string
   | number
+  | bigint
-  | LabeledExpression<string | number>
+  | LabeledExpression<string | number | bigint>

This is consistent with i18n._() which already accepts Values = Record<string, unknown>.

Workaround users currently need

// Zod validation bounds
t`Min. ${Number(min)} characters`  // wrapping in Number()

With this fix:

t`Min. ${min} characters`  // works directly

[vercel]

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[timofei-iatsenko]

Related #2502

[vercel]

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Project	Deployment	Actions	Updated (UTC)
js-lingui	Ready	Preview	Apr 15, 2026 2:59pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.21%. Comparing base (6bb8983) to head (04f486c).
⚠️ Report is 268 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2507      +/-   ##
==========================================
+ Coverage   77.05%   81.21%   +4.16%     
==========================================
  Files          84      104      +20     
  Lines        2157     2720     +563     
  Branches      555      725     +170     
==========================================
+ Hits         1662     2209     +547     
+ Misses        382      364      -18     
- Partials      113      147      +34     

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